Leonardo da Vinci sketched a diving suit for underwater exploration.
Leonardo’s notes from the early sixteenth century describe equipment intended to let a diver remain underwater. The proposed suit included a mask, breathing tubes, and components connected with air supply and buoyancy. The concept is usually associated with plans for underwater military operations, including the possibility of approaching enemy vessels beneath the surface.
The design is often presented as though Leonardo invented modern scuba equipment, but that overstates the evidence. His notes do not establish that he built or tested a complete suit, and the proposed breathing arrangement was not the same as an independent compressed-air scuba system. Modern diving equipment depends on pressure-resistant cylinders, regulators, and carefully engineered materials.
Leonardo’s idea nonetheless shows a sophisticated attempt to solve several linked problems: breathing, visibility, movement, and protection in water. It belongs alongside his studies of swimming, water flow, pumps, and military engineering. The surviving drawings reveal an invention concept rather than a documented working device.